I'd fight myself,or rather a clone of me from right now.
We would both have the same moves,know how to counter them and couldn't cheese each other to death like link/shadow link.
The result would be an epic eternal fight that would grow to be more and more spectacular as we both try new and more intricate techniques to get the better hand,knowing full well it would be in vain seeing as the other would come up with the same exact things.
Once in a while,weapons would be thrown in the arena.
Because we would fight in an arena.With Fire.And acid fountains.And nuclear sea crocodiles with laser breath and x-ray vision.
Fuck,that would be the best selling show of all times.I need to get started on that.